I gave my 2003 model a new piston at 128.000km. The ringshad almost 1,, ring gap, but it didnt use oil.
Everything else looked and worked fine, and the bike didnt seem to gain power with a rebuild. I just thought I'd be better safe than sorry, because I use it to commute to work.
I've been using dino oil (although not much) semi synthetic, and full synthetic, in just about avery viscocity range, 5w40, 10w/40, 10w50, 20w50.
I've been using a lot of different brands, but mostly Procycle from louis, fullsynthetic 10w50. I've been chaning oil at around 5000km, and oilfilter very 2 or 3 times (have never seen any "dirt" in them)
Im closing in on 160.000km..
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